Triethylamine → 2-Bromo-2-methyl-propionic acid 2-(2,2-dimethoxy-ethoxy)-ethyl ester

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A solution of 2-(2,2-dimethoxy-ethoxy)-ethanol (2.20 g, 14.6 mmol) from Example 9 in dry triethylamine (3.0 mL, 21 mmol) and dry methylene chloride (30 mL) was stirred at 0° C. 2-bromo-2-methylpropionyl bromide (1.7 mL, 14 mmol) methylene chloride (10 mL) was then added to the alcohol over a 15 minute period. The reaction mixture was warmed to room temperature and stirred overnight. The reaction mixture was filtered, the filtrate was washed with saturated sodium bicarbonate, and dried with magnesium sulfate. The solvent was removed and the yellow oil purified by column chromatography. 1H NMR (300 MHz, CDCl3): δ=1.78 (s, 6H), 3.31 (s, 6H), 3.49 (d, 2H), 3.68 (t, 2H), 4.25 (t, 2H), 4.46 (t, 1H) 13C NMR (300 MHz, CDCl3): δ=31.23, 55.85, 56.15, 65.58, 69.55, 71.44, 103.09, 172.07.

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